"Howdy," right back at you. If you get accepted to all three and you have to choose, one of the factors you may look at is location. Here's a nice comparision of the three (ranked by Forbes in 2004, out of 40 cities):
I was in your situation a few yrs ago and picked Houston. There were a lot of reasons. Starting clinic a semester earlier, the opportunities in research and the specialty clinics were a few things that attracted me. Certainly where you might want to end up practicing is something to think about as well.